Design of hinge joint

Well, there is no tool in WA that let's us draw inside an answer box for a question that asks to diagram something like a hinge joint. And, I'm not allowed to tell you to just look it up in a search engine, but that should be easy to do. The way I do it is to go to google.com and select Images. But, you can also use your imagination and I'll help you draw it in your mind. If you are a visual, tactile, or auditory learner follow these steps: Go to the nearest door wherever you are right now and open and close it a few times. Then look at the hinges that hold the door in the jam. Now bend your knee or elbow a few times and imagine that something like the hinge you saw for the door is inside your body and holding your joints together as you bend (flex) and unbend (extend) your forearm or knee. Now take out a piece of paper and a pen or pencil and draw two squares right next to each other and share one side, or line. Then imagine that it is moving like the door hinge or your elbow and then draw in whatever you think might help other people understand your diagram of a hinge joint. Then to finish it off, especially for auditory people is to imagine the joint making a sound like a squeaky door as it opens and closes. That should be an Excellent diagram by now, so find someone and explain it to them so they can enjoy what you learned as much as you did.